Cranberry Lake is on the east branch of the Oswegatchie River in the Adirondack Park in New York in the United States.

The 118,000-acre (480 km2) Five Ponds Wilderness Area abuts its south shore, and the Cranberry Lake Wild Forest covers much of its remaining shoreline.

On a western arm of the lake in the Town of Fine, is the community of Wanakena, the location of the SUNY-ESF Ranger School.

The Cranberry Lake Biological Station, also part of State University of New York College of Environmental Science and Forestry (SUNY-ESF), is located on Barber Point.

[2] There is a large camp setting called Wildcliffe Lodge (formerly "Hoppies" and then "Verns") that used to have an inn, bar and restaurant.

A large garden provided fresh vegetables and remnants of this still exist on private property abutting the Five Ponds Wilderness.

[citation needed] The Rich Bros. Lumber Co. donated 1,800 acres (7.3 km2) in the vicinity of Cranberry Lake to the New York State Ranger School in 1912.

A businessman, Charles Lathrop Pack, donated 1,000 acres (4.0 km2) of what today is the Cranberry Lake Biological Station to the New York State College of Forestry in 1923.